More Info on Global Warming

KIRK1ADM · Mar 21, 2008

I came across this article tonight on the NPR website. It has some interesting information about the subject of global warming.

· Some 3,000 scientific robots that are plying the ocean have sent home a puzzling message. These diving instruments suggest that the oceans have not warmed up at all over the past four or five years. That could mean global warming has taken a breather. Or it could mean scientists aren't quite understanding what their robots are telling them.

This is puzzling in part because here on the surface of the Earth, the years since 2003 have been some of the hottest on record. But Josh Willis at NASA's Jet Propulsion Laboratory says the oceans are what really matter when it comes to global warming.

In fact, 80 percent to 90 percent of global warming involves heating up ocean waters. They hold much more heat than the atmosphere can. So Willis has been studying the ocean with a fleet of robotic instruments called the Argo system. The buoys can dive 3,000 feet down and measure ocean temperature. Since the system was fully deployed in 2003, it has recorded no warming of the global oceans.

"There has been a very slight cooling, but not anything really significant," Willis says. So the buildup of heat on Earth may be on a brief hiatus. "Global warming doesn't mean every year will be warmer than the last. And it may be that we are in a period of less rapid warming."

In recent years, heat has actually been flowing out of the ocean and into the air. This is a feature of the weather phenomenon known as El Nino. So it is indeed possible the air has warmed but the ocean has not. But it's also possible that something more mysterious is going on.

That becomes clear when you consider what's happening to global sea level. Sea level rises when the oceans get warm because warmer water expands. This accounts for about half of global sea level rise. So with the oceans not warming, you would expect to see less sea level rise. Instead, sea level has risen about half an inch in the past four years. That's a lot.

Willis says some of this water is apparently coming from a recent increase in the melting rate of glaciers in Greenland and Antarctica.

"But in fact there's a little bit of a mystery. We can't account for all of the sea level increase we've seen over the last three or four years," he says.

One possibility is that the sea has, in fact, warmed and expanded — and scientists are somehow misinterpreting the data from the diving buoys.

But if the aquatic robots are actually telling the right story, that raises a new question: Where is the extra heat all going?

Kevin Trenberth at the National Center for Atmospheric Research says it's probably going back out into space. The Earth has a number of natural thermostats, including clouds, which can either trap heat and turn up the temperature, or reflect sunlight and help cool the planet.

That can't be directly measured at the moment, however.

"Unfortunately, we don't have adequate tracking of clouds to determine exactly what role they've been playing during this period," Trenberth says.

It's also possible that some of the heat has gone even deeper into the ocean, he says. Or it's possible that scientists need to correct for some other feature of the planet they don't know about. It's an exciting time, though, with all this new data about global sea temperature, sea level and other features of climate.

"I suspect that we'll able to put this together with a little bit more perspective and further analysis," Trenberth says. "But what this does is highlight some of the issues and send people back to the drawing board."

Trenberth and Willis agree that a few mild years have no effect on the long-term trend of global warming. But they say there are still things to learn about how our planet copes with the heat.
Click to expand...

Source

Azure · Mar 21, 2008

To expand a bit on this...

http://www.merinews.com/catFull.jsp?articleID=130951

THE WINTER this year was unusually long and harsh. What possibly could explain the occurrence of unusual cold wave conditions this year throughout the globe when environmentalists voicing their concerns about the human-led global warming had predicted that the rise in carbon dioxide level in the atmosphere would result in shorter winters with no significant dip in the mercury? Was this winter an exception to the rule or is it simply following a trend? After all, studies conducted by a small group of ‘sceptic’ scientists reveal that global warming has been waning since 2001. Latest studies supported by satellite data cast doubt on the climate fears propounded by environmentalists supported by the UN Intergovernmental Panel on Climate Change (IPCC).

Satellite measurements available since 1979 show no warming in the southern hemisphere and the trend in the northern hemisphere appears to have waned since 2001. In August 2007, the UK Met Office acknowledged that obvious global warming had stopped. Paleo-climate scientist Bob Carter testifying before the US Senate Committee on Environment and Public Works has noted that the accepted global average temperature statistics used by IPCC show no ground-based warming has occurred since 1998. A research led by David Bromwich, Professor of Atmospheric Science in the Department of Geography at Ohio State University and researchers with the Byrd Polar Research Centre at Ohio State University shows that during the late 20th century, the temperature in Antarctica did not rise to the level predicted by many global warming models. According to UN scientist Madhav L. Khandekar, a retired Environment Canada scientist and an expert IPCC reviewer in 2007, the recent worldwide analysis of ocean surface temperatures shows that sea surface temperatures over world oceans are slowly declining since mid-1998.

While the level of carbon dioxide in the atmosphere is steadily rising from 280 ppm and might reach 560 ppm by 2100 as predicted by IPCC, the world’s average temperature, instead of following a steep upward gradient, is actually plunging after a period of upward trend. However, the IPCC is not coming out publicly with the truth surrounding the correlation between rise in carbon dioxide level in the atmosphere and its possible consequence on global warming, if any. A study by researchers of the Atmospheric Science Group, Department of Mathematical Science, at the University of Wisconsin, found that global warming in the last century was linked to natural causes. The Royal Meteorological Institute at Brussels in its report last year said that not carbon dioxide but the most important greenhouse gas was water vapour; it was responsible for 75 per cent of the greenhouse effect. According to Belgian climate scientist Lu Debontridder, the warm winters of the last few years in Belgium are simply due to the North-Atlantic oscillation that has absolutely nothing to do with carbon dioxide. A study published in Science last September found that contrary to past inferences from ice core records, carbon dioxide did not cause the end of the last ice age. According to the same study, deep-sea temperatures warmed about 1,300 years before the tropical surface ocean and well before the rise in atmospheric carbon dioxide. USC geologist Lowell Scot, the lead author of the study, said that the climate dynamics are much more complex than simply saying that carbon dioxide rises and the temperature warms.
Click to expand...

Jeff Cooper Disciple · Mar 21, 2008

I'm feeling warmer already. Of cuorse rum does that to me.

Volpone · Mar 21, 2008

I got as far as 3,000 Science Robots, scouring the ocean floor and got sidetracked by visions of robotic hoards, swarming over the earth.

RISE OF THE MACHINES!

KIRK1ADM · Mar 22, 2008

Volpone said: ↑

I got as far as 3,000 Science Robots, scouring the ocean floor and got sidetracked by visions of robotic hoards, swarming over the earth.

RISE OF THE MACHINES!
Click to expand...

LOL, yes, but none of these robots look like this robot.

Forbin · Mar 22, 2008

ROBOT STING RAYS! ROBOT STING RAYS!!!! WE'RE ALL DOOMED!!!!

KIRK1ADM · Mar 22, 2008

Forbin said: ↑

ROBOT STING RAYS! ROBOT STING RAYS!!!! WE'RE ALL DOOMED!!!!
Click to expand...

Steve Irwin agrees.

Log in or Sign up

More Info on Global Warming

KIRK1ADM Bored Being

Azure I could kick your ass

Jeff Cooper Disciple You've gotta be shittin' me.

Volpone Zombie Hunter

KIRK1ADM Bored Being

Forbin Do you feel fluffy, punk?

KIRK1ADM Bored Being

Log in or Sign up

More Info on Global Warming

KIRK1ADM Bored Being

Azure I could kick your ass

Jeff Cooper Disciple You've gotta be shittin' me.

Volpone Zombie Hunter

KIRK1ADM Bored Being

Forbin Do you feel fluffy, punk?

KIRK1ADM Bored Being

Useful Searches